hi there, well you sure you run the install script and it finished properly?

As about the license, yep it seems you did it the right way.

Another reason for causing white screens is that one or some of the script files might have not been uploaded or uploaded the wrong way. All must be uploaded to BINARY.

Another reason white screens were appearing in the past, is because the Zend Optimizer that is installed on your server. There was one buggy version of it, causing white screens, and the fix was to upgrade the Zend Optimizer to latest version.

Check please on these things and if nothing helps, pm me url and probably ftp access to your site, so i can go and find the problem._________________